Summarizing,
the nested reduction (REF ) is valid up to the \(l\) -th timescale if the \(l\) -chain \({\mathcal {M}}_0 \rhd {\mathcal {M}}_1 \rhd \ldots \rhd {\mathcal {M}}_l\)  is hyperbolically attractive (see [1]}, [2]}). The slowest timescale quasi-steady state reduction (REF ) is
valid if the \(m\) -chain \({\mathcal {M}}_0 \rhd {\mathcal {M}}_1 \rhd \ldots \rhd {\mathcal {M}}_m\)  is hyperbolically attractive.
